I use my 50mm f/1.8D on my D40 & D5000 all the time... And they don't have focussing motors. Why would someone not be able to use it on a D5200 or D3200?

Wait, there isn't a reason.

I think AF has many benefits and to pretend that the lack of focus motor is no issue isn't helpful. Yes its possible to autofocus....

Its worth playing with the cameras. In the end I got a lightly used D90 mainly for the view finder. The Af points are easier to see, it has grid lines which I find useful for getting the camera level. The viewfinder is alot bigger and brighter